Shock-absorber.



B. W. DAVIS.

- SHGGK ABSORBER. APPLICATION FILED JUIlY''zf 1907. RBN'WBD MAY 2s. 1910*. '1,1 1 1,739. Patented Sept.29,1914.

2 SHEETS*SHBET 1.

Y. llllmnm.

B. W. DAVIS. SHOCK ABSORBER. APPLICATION FILED JULY 22, 1907. 4RENEWED MAY 23, 1910.

1,111,789. 1 l Patented Sept.29,1914.

2 SHEETS-SHEET 2.

ren sra'rnsi retrasa ori BENJAMIN w. Da'vrs, or PHILLIPS, wiseonsmfg SHOCK-essonne.

Mimes. SpecificationofLttersPateni. ratented *septfeegiei-i.

appiieation mea July' 22, 1907, serial no. 384,982. Renewed nav 23, 1910. senin no. 563mm.

To all 'whom it mag/concern: matic chamber. The chamber isYV prmided -Be it lgnown that l, BENJxMiN WDAVIS, with means for'permitting the passage oi aj'citfizen of the United States, residing at, 'air therefrom .when it .is compressedgindio P hillips, in the county of Price andState ifor restricting the return of air `thereto of' l/Viscons'in, have invented certain new when it expands incident to the rebound a'iiduseful Improvements in Shock-bsorbof Athe connected parts. Means are provided ers, of' which the following is a'specilication. for so supporting the flexible .wall of the My yinvention relates in general to appa-- chamber that itwill be distended--against 65 ratus for'- absorbing shocks; and more paratmospheric pressure' when the chamber exticularly'to al pneumatic device for 'Jdissipands, thereby utilizing the pressure of the patinf'githe `vibrations of vehicles, incident atmosphere yto retard the rebound. l totheirpassage over uneven surfaces'. r My invention will be more fully described l^'l )n'enrn" itic tires are recognized as aordlhereinarter with.. reference to the acc'om-v 70 ing'the'inos't perfect means' for preventing panying drawings, in which the same `is I jol'ts and jars to which vehiclewheels Tilliistratedvasf` embodied in two' convenient aref'subjected yfrom being ommunic'atedto `andpracti'cal forms, and in which- Ithegoccupants f of the vehicle. vPneumatic 3 Figure 1 is a vertical'seetional view,psirts l tiresI are, however,v open to thevery serious beingy shown -in elevation. Fig. 2 isaviewy 75 objection'that they readily puncture, there similar to Fig. l, `showing the chamber I by 'not-only causing annoyanceand trouble,v ,compressedf Fig. 3 is a view similarv to permittfing'- a shock. to expel` airv froma Fig; 6 is 'a' view similar to Fig. 5, showing f lhas the'reboundbee'n retarded'by the ac- Ion lineTLFi but also 'incurrmg much expense. i f liig. 2, 'showing thepositionof the flexible l'Ithas heretofore been proposed t-o interwalls of the chamber when the' parts .re-- p'ose'pneumatic'springsor cushions between bound. bmg.. 14 isa view similar toFg. so the'y axles and the bodies of vehicles in lieu l, showing a modified -o'rm 'of my invens of. using pneumatic tires. Oneform of suchl gtion. Fig. -5 vis aviewV of theinodified form deviceskcoveie'd by my prior -Patent No. ,of my invention'"shown in'Fig. 4,*illustrat-I 611,377 operates. to retard 'the rebound ing'thechamber when subjected to a shock;

ctisliio'n and by restricting the return 'of Kthe position lof' the flexible vwall of the the expelled air. In no pneumaticv` cushion ychamber"*during the rebound of the con-lv heret'oore devised, so far as l am aware, nected'.fparts;.and'lfigz7 'isa sectional View 11. 1- tion. of atmospheric pressure iiponv Ythe vl Similar reilerence characters are used to'ln'fe 'cushion when compressed, and 1t is the fdesignatefsimilfar 1 parts`v` "in .the 4several figprim'aryobj'ect of lmy present inventionto lures of thedra?vlii'igs'.''l l provide a pneumaticspringwhich will not 'Referring' more' particularly to Figs. 1, 2` only, prevent a v rebound after compression .and 3, reference'character-A indicates a porbyrestricting the return of air lexpelled' {tion-.Qta vehicleb'o'dy',while B indicates a 95 roi'ii'-the cushion, but'f also by the actioii'oi portion of onejof rthe axles o f the vehicle.

atinbspheric'pre'ssure upon the cushion after It will,'o'co 1' 1rse,be iunderstoodthat my -incompression," therebyl permitting* only".l a @ventionfis not'ljimite'd'inits"use"toa vehicle tlieshck' of therecoil will be ifeducedto nection in orde "that one of its applications'loo minimum 7 maybedislosedi' Reference cllara'cterjA further object lof my inventionis 'to designates a post depending" from'and rig! pro-vide a `rpneiiniatie spring for vehicles, idly securedto ythe" vehiclebody ata point ywhich''will be imple-in.'construction, inexabove the axle; by anyfsuitablvmeans, as,` pensive'in manufacturapandefficient opfor`y instance', bolts or screws a.' Bf `riesig-105 eration. M ff 1 ,nates'a post'securedto and projecting above The elibodimentf of my' invention' herein the axle Batfa point, substantially below disclosedinay-be generally described as comtliebracket. Any snitablefastening dev prisingf afpneumat'ic chamber interposed bevices may be employedforsecuring the' post tweentwo relatively movable parte, as', for. -to the..axle, siclfnA 'for instance'yes' U- 1170 y instance, theaxle'andbody of a `vehiele, shaped straps?)V extending aroi'indthe' axle meenemen haring@ flexibiewan which is amrthmugh haies im the everiyingease normally distende/d," but which, collapses platel of thep'ost,nutsbeing secured' to;v 'the artrdi" eknlsi'iiof air from the pneuends of thefstrapswhch fprcjecrabvelthef tion indicated in Fig. 6.

stantially thesame as the operation of the form of my inve tion shown in Figs. 1, 2 and 3; When the 'connected parts are suddenly moved toward each otherthe air, with-- ceased moving toward each other. The initial movements of the connected parts away from leach other results in partial jvacuum being formed in the chamberA so that the flexible wall is forced inwardlyto the posii The further sepa ration of the connected parts consequently must straighten 'the flexible wall against the atmospheric pressure, thereby retardin'g the recoil of the connected parts.

From the foregoing description it'will be observed that l. have invented an improved shock absorbing device which is capable' of various uses, and which serves to gradually diminish and finally stopthe movement of the two' connected parts toward each other, and which also serves tofretard the separa-v tion of the parts pressure, thereby preventing sudden and in'- jurious recoil of the 'connected parts. lt will further bevobserved that my improved pneumatic cushion is exceedingly exible and willapermit the relative movement of the connected parts without liability oi"v the .chamber being so ruptured as to permit leakage. i

'I claim: l 1. In a shock absorbing device, the combination with an expansible andcompre's'sible chamber containing fluid, of means lfor l securing vsaid, chamber to tworelatively 'movable members,

expulsion of fluid from sald chamber when means for permitting the compressed ,by the movement of. said members toward each other, means for restricting-the return of fluid to said chamber when expanded by the relative movement of said members apart, and means for utilizing the atmospheric pressure to retard. the expansion of said chamber.

2. In a shock absorbing device, the combination with an expansible and compressible chamber having a flexible wall and. containmg Huid, means for securing said chamber to two relatively movable members, means for permitting the expulsion of ,fluid from said chamber` when compressed, means for restricting thereturn of uid to said chamber during expansion, and means for supporting said flexible wall so as to be forced against atmospheric pressure during the expansion of saidchamber.

the position 'shown' in Fig, 5 when the connected parts havev versely.

by' utilizing atmospheric tion extending within .3. In va shock absorbing device, the combinationof an expansible and compressible chamber airtight containing Huid under pressure and comprising a substantially hemispherical flexible wall, of means for securing said "chamber directly totwo relameans for permittively movable members, #ting the expulsion 'of fluid `from said chamber during its compression, means for re stricting the return of fluid to said chamber 'during its expansion, said wall permanently distended trans- 4. Ina

chamber containing Huid, of means for securing said chamber to two relatively mova ble members, means for permitting the expulsion of Huid from. said chamber when compressed by the movement of said members toward each other and for permitting the return of fluid to said chamber when expanded by the relative movement of said inembers'apart, and means for utilizing the atmospheric pressure sion of said chamber. y

5. lin-a shock absorbing device, the combinatio'n' with an extensible and compressible air-tight chamber 'containing' fluid, of

shock absorbing device, the combi- 1 nation withl an expansible and compressible and means for holding Ato retard the expan aol means for securing said chamber direct-ly to l two relatively movable members between which the .chamber is interposed, means for permitting the expulsion of Huid from said .chamber when compressed by the movement v`of said members toward each other and for l ermitting the return of `fluid to said chanter when expanded by the relative movement of said members apart, land a projecsaid chamber to support one of the movable members upon the other should said chamber collapse.

6. In a shock absorbing device, the combination with an expansible and compressible chamber containing fluid under pressure and comprising two substantially semi-spherical flexible walls, means for respectively securing said walls'ftbfftwo relatively movable members, meansvffforv-"permitting the expulsion of fluid from "said chamber when compressed by the movement of said members toward each other and permitting the return oie tluidto said chamber when expanded by the relative movement of saidmembers apart, and an inexpansible ring interposed between and secured to said semi-spherical walls for holding said chamber permanently distended intermediate of the connections with the relatively movable members. v BENJAMIN W. DAVIS. Witnesses: s

GEO. L. WILKINSON,

`Anna L. SAVOIE. 

